" your ID is your payroll number..." No! Listen to me!"
The company running a course I was taking couldn't make up their minds what my real name was. Their correspondence had me down as firstname lastname middle name and lastname middlename firstname.
Start the course and the lecturer says he's set accounts up in the form of firstname.lastname.
No combination of the above variations worked. I had to ask the lecturer what the system thought my login was, and he couldn't understand the question, simply repeating "Firstname dot lastname".
We set up a completely new id in the end.